Add hasCorrectAlt method to PDMediaClip

[LonelyMidoriya]

Summary by CodeRabbit

• New Features
  • Added validation for alternative text properties in media clips to ensure proper structure and content requirements are met.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7940d8aa-4b4a-41b3-8b83-f0bf2328eb25

📥 Commits

Reviewing files that changed from the base of the PR and between dbd7c33 and bef1986.

📒 Files selected for processing (1)

• src/main/java/org/verapdf/pd/actions/PDMediaClip.java

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📝 Walkthrough

Walkthrough

A public validation method hasCorrectAlt() was added to the PDMediaClip class to verify that the ALT property exists as a correctly-formatted array with alternating non-empty string elements and even length.

Changes

Cohort / File(s)	Summary
ALT Validation src/main/java/org/verapdf/pd/actions/PDMediaClip.java	Added public method hasCorrectAlt() that validates the ALT property: confirms it exists as a COS_ARRAY with even length, all elements are COS_STRING, and elements at odd indices contain non-empty strings.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 A validation hop, so neat and clean,
Checking ALTs with logic keen,
Even arrays, strings that gleam,
PDMediaClip fulfills its dream! 📋✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a new public method hasCorrectAlt() to the PDMediaClip class.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch media-clip

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