XPath
001 package org.gxml.book.xpath;
002
003 import org.gxml.book.common.SampleApp;
004 import org.gxml.sa.GxMetaBridge;
005 import org.gxml.sa.GxNameBridge;
006 import org.gxml.sa.GxProcessingContext;
007 import org.gxml.sa.GxVariantBridge;
008 import org.gxml.xdm.Emulation;
009 import org.gxml.xs.SmName;
010 import org.gxml.xs.SmNativeType;
011
012 import com.tibco.gxml.sa.api.common.lang.ExprResult;
013 import com.tibco.gxml.sa.api.common.lang.GxExpr;
014 import com.tibco.gxml.sa.api.common.lang.GxExprContextDynamicArgs;
015 import com.tibco.gxml.sa.api.common.lang.GxExprContextStaticArgs;
016 import com.tibco.gxml.sa.api.common.lang.GxFocus;
017 import com.tibco.gxml.sa.api.common.lang.GxLanguageToolKit;
018 import com.tibco.gxml.sa.processor.xquery.LanguageToolKit;
019 import com.tibco.gxmlsa.processor.org.exslt.math.ExsltMathFunctionGroup;
020
021 public abstract class XPathSample<I, U, N extends I, A extends I, S, T, X> extends
SampleApp<I, U, N, A, S, T, X>
022 {
023 public void testGettingStarted() throws Exception
024 {
025 final GxProcessingContext<I, U, N, A, S, T, X> pcx = newProcessingContext();
026
027 // For demonstration purposes, register the language toolkit with the processing context.
028 pcx.register("xyz", new LanguageToolKit<I, U, N, A, S, T, X>(pcx));
029
030 @SuppressWarnings("unchecked")
031 // Immediately get back the registered processor.
032 GxLanguageToolKit<I, U, N, A, S, T, X> xtk = pcx.getProcessor("xyz",
GxLanguageToolKit.class);
033
034 final GxExprContextStaticArgs<I, U, N, A, S, T, X> sarg = xtk.newStaticContextArgs();
035
036 final GxMetaBridge<A, S, T> metaBridge = pcx.getMetaBridge();
037
038 final ExprResult<I, U, N, A, S, T, X> prepared = xtk.prepare("concat('Hello', ', ',
'World', '!')", metaBridge.emptyType(), sarg);
039 final GxExpr<I, U, N, A, S, T, X> expr = prepared.getExpr();
040
041 final GxExprContextDynamicArgs<I, U, N, A, S, T, X> darg = xtk.newDynamicContextArgs();
042
043 final String strval = expr.stringFunction(xtk.emptyFocus(), darg, pcx);
044
045 assertEquals("Hello, World!", strval);
046 }
047
048 public void testBindingVariables() throws Exception
049 {
050 final GxProcessingContext<I, U, N, A, S, T, X> pcx = newProcessingContext();
051
052 final GxLanguageToolKit<I, U, N, A, S, T, X> xtk =
new LanguageToolKit<I, U, N, A, S, T, X>(pcx);
053
054 final GxExprContextStaticArgs<I, U, N, A, S, T, X> statArgs = xtk.newStaticContextArgs();
055 statArgs.setEmulation(Emulation.MODERN);
056
057 final GxNameBridge<S> nameBridge = pcx.getNameBridge();
058 final SmName<S> varName = new SmName<S>(nameBridge.symbolize("x"), nameBridge);
059
060 final GxMetaBridge<A, S, T> metaBridge = pcx.getMetaBridge();
061 statArgs.bindVariableType(varName, metaBridge.getType(SmNativeType.STRING));
062
063 final String es = "concat('Hello', ', ', $x, '!')";
064 final T sfocus = metaBridge.emptyType();
065
066 final ExprResult<I, U, N, A, S, T, X> prepared = xtk.prepare(es, sfocus, statArgs);
067
068 final GxExprContextDynamicArgs<I, U, N, A, S, T, X> dynArgs =
xtk.newDynamicContextArgs();
069 dynArgs.setEmulation(Emulation.MODERN);
070
071 final GxVariantBridge<I, N, A, X> valueBridge = pcx.getVariantBridge();
072 final X value = valueBridge.stringValue("World");
073 dynArgs.bindVariableValue(varName, value);
074
075 final GxExpr<I, U, N, A, S, T, X> expr = prepared.getExpr();
076 final GxFocus<I> dfocus = xtk.emptyFocus();
077 final String strval = expr.stringFunction(dfocus, dynArgs, pcx);
078
079 assertEquals("Hello, World!", strval);
080 }
081
082 public void testEXSLT() throws Exception
083 {
084 final GxProcessingContext<I, U, N, A, S, T, X> pcx = newProcessingContext();
085 final GxNameBridge<S> nameBridge = pcx.getNameBridge();
086
087 final GxLanguageToolKit<I, U, N, A, S, T, X> xtk =
new LanguageToolKit<I, U, N, A, S, T, X>(pcx);
088
089 final GxExprContextStaticArgs<I, U, N, A, S, T, X> sarg = xtk.newStaticContextArgs();
090 sarg.getInScopeNamespaces().declarePrefix("math", nameBridge.symbolize
("http://exslt.org/math"));
091 final ExsltMathFunctionGroup<I, U, N, A, S, T, X> exsltMathFunctionGroup = new
ExsltMathFunctionGroup<I, U, N, A, S, T, X>("http://exslt.org/math", pcx);
092 sarg.setFunctionSigns("http://exslt.org/math", exsltMathFunctionGroup);
093 // The function implementations can be provided now or just prior to execution.
094 sarg.setFunctionImpls("http://exslt.org/math", exsltMathFunctionGroup);
095
096 final GxMetaBridge<A, S, T> metaBridge = pcx.getMetaBridge();
097
098 final ExprResult<I, U, N, A, S, T, X> prepared = xtk.prepare("math:exp(1)",
metaBridge.emptyType(), sarg);
099
100 final GxExpr<I, U, N, A, S, T, X> expr = prepared.getExpr();
101
102 final GxExprContextDynamicArgs<I, U, N, A, S, T, X> darg = xtk.newDynamicContextArgs();
103 // Here we also (redundantly) provide the function implementations just prior to execution.
104 darg.setFunctionImpls("http://exslt.org/math", exsltMathFunctionGroup);
105
106 final String strval = expr.stringFunction(xtk.emptyFocus(), darg, pcx);
107
108 assertEquals("2.7182818284590455", strval);
109 }
110
111 public void testExpressionType() throws Exception
112 {
113 final GxProcessingContext<I, U, N, A, S, T, X> pcx = newProcessingContext();
114
115 final GxLanguageToolKit<I, U, N, A, S, T, X> xtk =
new LanguageToolKit<I, U, N, A, S, T, X>(pcx);
116
117 final GxExprContextStaticArgs<I, U, N, A, S, T, X> sarg = xtk.newStaticContextArgs();
118
119 final GxMetaBridge<A, S, T> metaBridge = pcx.getMetaBridge();
120
121 final ExprResult<I, U, N, A, S, T, X> prepared = xtk.prepare("'Hello'",
metaBridge.emptyType(), sarg);
122 /* final GxExpr<I, U, N, A, S, T, X> expr = */prepared.getExpr();
123 /* final GxExprInfo<T> info = */prepared.getInfo();
124 }
125 }
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